A fall line (or fall zone) is the area where an upland region and a

coastal plain A coastal plain is flat, low-lying land adjacent to a sea coast. A fall line commonly marks the border between a coastal plain and a piedmont area. Some of the largest coastal plains are in Alaska and the southeastern United States. The Gulf Coa ...

meet and is typically prominent where rivers cross it, with resulting rapids or

waterfall A waterfall is a point in a river or stream where water flows over a vertical drop or a series of steep drops. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf. Waterfalls can be formed in several wa ...

s. The uplands are relatively hard crystalline basement rock, and the

is softer

sedimentary rock Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...

. A fall line often will recede upstream as the river cuts out the uphill dense material, forming "c"-shaped waterfalls and exposing bedrock

shoals In oceanography, geomorphology, and geoscience, a shoal is a natural submerged ridge, bank, or bar that consists of, or is covered by, sand or other unconsolidated material and rises from the bed of a body of water to near the surface. I ...

. Because of these features, riverboats typically cannot travel any farther inland without

portaging Portage or portaging (Canada: ; ) is the practice of carrying water craft or cargo over land, either around an obstacle in a river, or between two bodies of water. A path where items are regularly carried between bodies of water is also called a ...

, unless

locks Lock(s) may refer to: Common meanings *Lock and key, a mechanical device used to secure items of importance *Lock (water navigation), a device for boats to transit between different levels of water, as in a canal Arts and entertainment * ''Lock ...

are built. The rapid change in elevation of the water and resulting energy release make the fall line a good location for

water mill A watermill or water mill is a mill that uses hydropower. It is a structure that uses a water wheel or water turbine to drive a mechanical process such as milling (grinding), rolling, or hammering. Such processes are needed in the production o ...

grist mill A gristmill (also: grist mill, corn mill, flour mill, feed mill or feedmill) grinds cereal grain into flour and Wheat middlings, middlings. The term can refer to either the Mill (grinding), grinding mechanism or the building that holds it. Grist i ...

s, and

sawmill A sawmill (saw mill, saw-mill) or lumber mill is a facility where logs are cut into lumber. Modern sawmills use a motorized saw to cut logs lengthwise to make long pieces, and crosswise to length depending on standard or custom sizes (dimensi ...

s. Seeking a head of navigation with a ready supply of water power, people have long made settlements where rivers cross a fall line.

Geography

The slope of fall zones on rivers played a role in settlement patterns. For example, the fall line represents the inland limit of navigation on many rivers. As such, many fall line cities grew around transferring people and goods between land-based and water-based transportation at this point.

Atlantic Seaboard Fall Line

The Atlantic Seaboard Fall Line, or Fall Zone, is a

escarpment An escarpment is a steep slope or long cliff that forms as a result of faulting or erosion and separates two relatively level areas having different elevations. The terms ''scarp'' and ''scarp face'' are often used interchangeably with ''escar ...

where the

Piedmont it, Piemontese , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , demographics1_title2 ...

and

Atlantic Coastal Plain The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth#Surface, Earth's surface and about 29% of its water surface area. It is known to separate the "Old World" of Afr ...

meet in the eastern

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

. Much of the Atlantic Seaboard fall line passes through areas where no evidence of

faulting In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...

is present. The fall line marks the geologic boundary of hard metamorphosed terrain—the product of the

Taconic orogeny The Taconic orogeny was a mountain building period that ended 440 million years ago and affected most of modern-day New England. A great mountain chain formed from eastern Canada down through what is now the Piedmont of the East coast of the Unit ...

—and the sandy, relatively flat outwash plain of the upper continental shelf, formed of unconsolidated

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of th ...

and

Tertiary Tertiary ( ) is a widely used but obsolete term for the geologic period from 66 million to 2.6 million years ago. The period began with the demise of the non-avian dinosaurs in the Cretaceous–Paleogene extinction event, at the start ...

sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand an ...

s. Examples of the Fall Zone include the Potomac River's Little Falls and the rapids in

Richmond, Virginia (Thus do we reach the stars) , image_map = , mapsize = 250 px , map_caption = Location within Virginia , pushpin_map = Virginia#USA , pushpin_label = Richmond , pushpin_m ...

, where the James River falls across a series of rapids down to the tidal estuary of the James River.

Columbia, South Carolina Columbia is the capital of the U.S. state of South Carolina. With a population of 136,632 at the 2020 census, it is the second-largest city in South Carolina. The city serves as the county seat of Richland County, and a portion of the city ...

is similar as well with the

Congaree River The Congaree River is a short but wide river in South Carolina in the United States; It flows for approximately 53 miles (85 km). The river serves an important role as the final outlet channel for the entire Lower Saluda and Lower Broad wate ...

. Before navigation improvements such as locks, the fall line was often the head of navigation on rivers due to rapids and waterfalls, such as the Little Falls of the

Potomac River The Potomac River () drains the Mid-Atlantic United States, flowing from the Potomac Highlands into Chesapeake Bay. It is long,U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map. Retrieved Augus ...

. Numerous cities were founded at the intersection of rivers and the fall line.

U.S. Route 1 U.S. Route 1 or U.S. Highway 1 (US 1) is a major north–south United States Numbered Highway that serves the East Coast of the United States. It runs from Key West, Florida, north to Fort Kent, Maine, at the Canadian border, making ...

links many of the fall line cities. Mid-Atlantic and Southern U.S. fall line cities include: *

Paterson, New Jersey Paterson ( ) is the largest City (New Jersey), city in and the county seat of Passaic County, New Jersey, Passaic County, in the U.S. state of New Jersey.Passaic River *

Trenton, New Jersey Trenton is the capital city of the U.S. state of New Jersey and the county seat of Mercer County. It was the capital of the United States from November 1 to December 24, 1784.Delaware River The Delaware River is a major river in the Mid-Atlantic (United States), Mid-Atlantic region of the United States. From the meeting of its branches in Hancock (village), New York, Hancock, New York, the river flows for along the borders of N ...

Philadelphia, Pennsylvania Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Sinc ...

, on the

Schuylkill River The Schuylkill River ( , ) is a river running northwest to southeast in eastern Pennsylvania. The river was improved by navigations into the Schuylkill Canal, and several of its tributaries drain major parts of Pennsylvania's Coal Region. It fl ...

Wilmington, Delaware Wilmington ( Lenape: ''Paxahakink /'' ''Pakehakink)'' is the largest city in the U.S. state of Delaware. The city was built on the site of Fort Christina, the first Swedish settlement in North America. It lies at the confluence of the Christina ...

, on Brandywine Creek *

Baltimore, Maryland Baltimore ( , locally: or ) is the List of municipalities in Maryland, most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic (United States), Mid-Atlantic, and List of United States cities by popula ...

, on the

Jones Falls The Jones Falls is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map , accessed April 1, 2011 stream in Maryland. It is impounded to create Lake Roland before running through the city of Baltim ...

Gunpowder Falls The Gunpowder River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed April 1, 2011 tidal inlet on the western side of Chesapeake Bay in Maryland, United States. It is formed by the jo ...

and

Gwynns Falls Gwynns Falls is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed April 1, 2011. stream located in Baltimore County and Baltimore City, Maryland. Its headwaters are located in Reisterstow ...

Washington, D.C. ) , image_skyline = , image_caption = Clockwise from top left: the Washington Monument and Lincoln Memorial on the National Mall, United States Capitol, Logan Circle, Jefferson Memorial, White House, Adams Morgan, ...

, on the

Fredericksburg, Virginia Fredericksburg is an independent city located in the Commonwealth of Virginia. As of the 2020 census, the population was 27,982. The Bureau of Economic Analysis of the United States Department of Commerce combines the city of Fredericksburg wi ...

, on the

Rappahannock River The Rappahannock River is a river in eastern Virginia, in the United States, approximately in length.U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed April 1, 2011 It traverses the entir ...

Hanover, Virginia Hanover is an unincorporated community and census-designated place (CDP) in Hanover County, Virginia, United States. It is the county seat and is located at the junction of U.S. Route 301 and State Route 54 south of the Pamunkey River. While his ...

, on the

North Anna River The North Anna River is a principal tributary of the Pamunkey River, about long,U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed April 1, 2011 in central Virginia in the United States. ...

Richmond, Virginia (Thus do we reach the stars) , image_map = , mapsize = 250 px , map_caption = Location within Virginia , pushpin_map = Virginia#USA , pushpin_label = Richmond , pushpin_m ...

, on the James River *

Petersburg, Virginia Petersburg is an independent city in the Commonwealth of Virginia in the United States. As of the 2020 census, the population was 33,458. The Bureau of Economic Analysis combines Petersburg (along with the city of Colonial Heights) with Din ...

, on the Appomattox River *

Weldon, North Carolina Weldon is a town in Halifax County, North Carolina, United States. The population was 1,655 at the 2010 census. It is part of the Roanoke Rapids, North Carolina Micropolitan Statistical Area. History In 1752, Daniel Weldon purchased 1,273 acre ...

, and

Roanoke Rapids, North Carolina Roanoke Rapids () is a city in Halifax County, North Carolina, United States. The population was 15,754 at the 2010 census. It is the principal city of the Roanoke Rapids Micropolitan Statistical Area, and is also an anchor city of the Rocky Mo ...

, on the

Roanoke River The Roanoke River ( ) runs long through southern Virginia and northeastern North Carolina in the United States. A major river of the southeastern United States, it drains a largely rural area of the coastal plain from the eastern edge of the Ap ...

* Rocky Mount, North Carolina, on the

Tar River The Tar River is a river that is approximately long, in northeast North Carolina flowing generally southeast to an estuary of Pamlico Sound. The Tar River becomes the tidal Pamlico River once it underpasses the U.S. Highway 17 Bridge in Wash ...

Raleigh, North Carolina Raleigh (; ) is the capital city of the state of North Carolina and the List of North Carolina county seats, seat of Wake County, North Carolina, Wake County in the United States. It is the List of municipalities in North Carolina, second-most ...

, on the

Neuse River The Neuse River ( , Tuscarora: Neyuherú·kęʔkì·nęʔ) is a river rising in the Piedmont of North Carolina and emptying into Pamlico Sound below New Bern. Its total length is approximately , making it the longest river entirely contained in ...

* Fayetteville, North Carolina, on the

Cape Fear River The Cape Fear River is a long blackwater river in east central North Carolina. It flows into the Atlantic Ocean near Cape Fear, from which it takes its name. The river is formed at the confluence of the Haw River and the Deep River (North Carol ...

Camden, South Carolina Camden is the largest city and county seat of Kershaw County, South Carolina. The population was 7,764 in the 2020 census. It is part of the Columbia, South Carolina, Metropolitan Statistical Area. Camden is the oldest inland city in South C ...

, on the

Wateree River } The Wateree River, about 75 mi (120 km) long, is a tributary of the Santee River in central South Carolina in the United States, which flows to the Atlantic Ocean. It was named for the Wateree Native Americans, a tribe who had migrate ...

, on the

Augusta, Georgia Augusta ( ), officially Augusta–Richmond County, is a consolidated city-county on the central eastern border of the U.S. state of Georgia (U.S. state), Georgia. The city lies across the Savannah River from South Carolina at the head of its navig ...

, on the Savannah River *

Milledgeville, Georgia Milledgeville is a city in and the county seat of Baldwin County in the U.S. state of Georgia. It is northeast of Macon and bordered on the east by the Oconee River. The rapid current of the river here made this an attractive location to buil ...

, on the

Oconee River The Oconee River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map Accessed April 21, 2011 river in the U.S. state of Georgia. Its origin is in Hall County and it terminates where it joins ...

Macon, Georgia Macon ( ), officially Macon–Bibb County, is a consolidated city-county in the U.S. state of Georgia. Situated near the fall line of the Ocmulgee River, it is located southeast of Atlanta and lies near the geographic center of the state of Geo ...

, on the

Ocmulgee River The Ocmulgee River () is a western tributary of the Altamaha River, approximately 255 mi (410 km) long, in the U.S. state of Georgia. It is the westernmost major tributary of the Altamaha.

Columbus, Georgia Columbus is a consolidated city-county located on the west-central border of the U.S. state of Georgia. Columbus lies on the Chattahoochee River directly across from Phenix City, Alabama. It is the county seat of Muscogee County, with which it ...

, on the

Chattahoochee River The Chattahoochee River forms the southern half of the Alabama and Georgia border, as well as a portion of the Florida - Georgia border. It is a tributary of the Apalachicola River, a relatively short river formed by the confluence of the Chatta ...

Tallassee, Alabama Tallassee (pronounced ) is a city on the Tallapoosa River, located in both Elmore and Tallapoosa counties in the U.S. state of Alabama. At the 2020 census, the population was 4,763. It is home to a major hydroelectric power plant at Thurlow ...

, on the

Tallapoosa River The Tallapoosa River runs U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed April 27, 2011 from the southern end of the Appalachian Mountains in Georgia, United States, southward and wes ...

Wetumpka, Alabama Wetumpka () is a city in and the county seat of Elmore County, Alabama, United States. At the 2020 census, the population was 7,220. In the early 21st century Elmore County became one of the fastest-growing counties in the state. The city is ...

, on the

Coosa River The Coosa River is a tributary of the Alabama River in the U.S. states of Alabama and Georgia. The river is about long.U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed April 27, 2011 ...

Tuscaloosa, Alabama Tuscaloosa ( ) is a city in and the seat of Tuscaloosa County in west-central Alabama, United States, on the Black Warrior River where the Gulf Coastal and Piedmont plains meet. Alabama's fifth-largest city, it had an estimated population of 1 ...

, on the

Black Warrior River The Black Warrior River is a waterway in west-central Alabama in the southeastern United States. The river rises in the extreme southern edges of the Appalachian Highlands and flows 178 miles (286 km) to the Tombigbee River, of which the Bl ...

Canada

The

Laurentian Upland The Laurentian Upland (or Laurentian Highlands) is a physiographic region which, when referred to as the "Laurentian Region" or the Grenville geological province, is recognized by Natural Resources Canada as one of five provinces of the larger ...

forms a long scarp line where it meets the

Great Lakes–St. Lawrence Lowlands The Great Lakes-St. Lawrence Lowlands, or simply St. Lawrence Lowlands, is a physiographic region of Eastern Canada that comprises a section of southern Ontario bounded on the north by the Canadian Shield and by 3 of the Great Lakes — Lake Huron ...

. Along this line numerous rivers have carved falls and canyons (listed East to West): * Saint Anne Falls and

Canyon Sainte-Anne Open from May to October, Canyon Sainte-Anne is a spectacular, steep-sided gorge, carved by the Sainte-Anne-du-Nord River, 6 km east of Beaupré, Quebec, Canada. The river drops over a waterfall within the canyon. Site and Visitors ...

( Sainte-Anne-du-Nord River) *Chaudron à Gaudreault ( Rivière aux Chiens) *Unnamed falls (

Rivière du Sault à la Puce The rivière du Sault à la Puce flows south, on the north shore of the Saint Lawrence river, in the municipality of Château-Richer, in the La Côte-de-Beaupré Regional County Municipality in the administrative region of Capitale-Nationale, in ...

) *Canyon of the

Cazeau River The Cazeau River flows south, on the north shore of the Saint Lawrence river, in the municipality of Château-Richer, in the La Côte-de-Beaupré Regional County Municipality, in the administrative region of Capitale-Nationale, in the provinces a ...

Montmorency Falls The Montmorency Falls (french: Chute Montmorency) is a large waterfall on the Montmorency River in Quebec, Canada. Location The falls are located on the boundary between the borough of Beauport, and Boischatel, about from the heart of old Q ...

(

Montmorency River The Montmorency River is a tributary of North-East bank of St. Lawrence river, flowing in the administrative region of Capitale-Nationale, in the province of Quebec, Canada. The course of the river successively crosses the regional county municip ...

) * Kabir Kouba Fall ( Saint-Charles River) *Chute Ford (

Sainte-Anne River The Sainte-Anne River is a tributary of the north shore of the Saint Lawrence River, whose mouth is located at Sainte-Anne-de-la-Pérade. This river flows in the province of Quebec, Canada, in the administrative regions of: * Capitale-Nationale: ...

) *Sainte-Ursule Falls ( Maskinongé River) *Chute à Magnan (

Rivière du Loup Rivière, La Rivière, or Les Rivières (French for "river") may refer to: Places Belgium * Rivière, Profondeville, a village Canada * La Rivière, Manitoba, a community * Les Rivières (Quebec City), a borough France * La Rivière, Girond ...

) *Chutes Émery and Chute du Moulin Coutu ( Rivière Bayonne) *Les sept chutes (

L'Assomption River The Assomption River (in French ''Rivière l'Assomption'', named after the Assumption of Mary) is the most important waterway in the Lanaudière region of Quebec, Canada. It is over long, and has a drainage basin (watershed) of . Its source is th ...

) * Dorwin Falls ( Ouareau River) *Wilson Falls ( Rivière du Nord) *Long Sault, now flooded by the

Carillon hydroelectric generating station The Carillon generating station (in French: ''centrale de Carillon'') is a hydroelectric Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electr ...

(

Ottawa River The Ottawa River (french: Rivière des Outaouais, Algonquin: ''Kichi-Sìbì/Kitchissippi'') is a river in the Canadian provinces of Ontario and Quebec. It is named after the Algonquin word 'to trade', as it was the major trade route of Eastern ...

) **The

Chaudière Falls , image = Ottawa Chaudiere Falls.jpg , image_size = 300px , caption = Chaudière Falls in June 2006, at summer water levels , map_image = , map_size = , coordinates = , coords_ref = , location ...

run over the unrelated Eardley Escarpment of the

Ottawa-Bonnechere Graben The Ottawa-Bonnechere Graben (also known as the Ottawa Graben) is a geological structure that coincides with a wide topographic depression extending from near Montréal through Ottawa. It is part of the Saint Lawrence rift system that also inclu ...

The

Jacques-Cartier River The Jacques-Cartier River is a river in the province of Quebec, Canada. It is 161 km long and its source is Jacques-Cartier Lake in Laurentides Wildlife Reserve, and flows in a predominantly southern direction before ending in the Saint Lawr ...

and

Saint-Maurice River The Saint-Maurice River (french: Rivière Saint-Maurice; Atikamekw: ''Tapiskwan sipi'') flows north to south in central Quebec from Gouin Reservoir to empty into the Saint Lawrence River at Trois-Rivières, in the province of Quebec, in Canada. F ...

lack such noticeable feature because they cross the scarp through

U-shaped valley U-shaped valleys, also called trough valleys or glacial troughs, are formed by the process of glaciation. They are characteristic of mountain glaciation in particular. They have a characteristic U shape in cross-section, with steep, straight s ...

s. The falls of the lower Saint-Maurice (as well as those of the Beauport River, in

Quebec City Quebec City ( or ; french: Ville de Québec), officially Québec (), is the capital city of the Provinces and territories of Canada, Canadian province of Quebec. As of July 2021, the city had a population of 549,459, and the Communauté métrop ...

) are due to the

fluvial terrace Fluvial terraces are elongated terraces that flank the sides of floodplains and fluvial valleys all over the world. They consist of a relatively level strip of land, called a "tread", separated from either an adjacent floodplain, other fluvial te ...

s of the

Saint Lawrence river The St. Lawrence River (french: Fleuve Saint-Laurent, ) is a large river in the middle latitudes of North America. Its headwaters begin flowing from Lake Ontario in a (roughly) northeasterly direction, into the Gulf of St. Lawrence, connectin ...

rather than the Laurentian Scarp.

References

External links

* {{DEFAULTSORT:Fall Line Geographic coordinate lists Geomorphology

Geography

Atlantic Seaboard Fall Line

Canada

See also

References

External links